CVE-2026-90205

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90205", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.793Z", "datePublished": "2026-09-17T16:07:21.521Z", "dateUpdated": "2026-10-30T12:34:45.443Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:34:45.443Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate orphan slot during inode read\n\nPatch series \"ocfs2: validate active orphan slots during inode read\".\n\nOCFS2 trusts active ordinary and append-DIO orphan slots read from dinodes.\nA corrupted slot can therefore index osb_orphan_wipes or the slot-local\nsystem-inode cache outside their allocations before the corruption is\nreported.\n\nPatch 1 validates the ordinary orphan slot used by inode wipe processing.\nPatch 2 validates the append-DIO orphan slot used by DIO completion and\norphan recovery. Both checks reject corrupt metadata at the existing inode\nvalidation boundary.\n\n\nThis patch (of 2):\n\n[BUG]\nA corrupted dinode with OCFS2_ORPHANED_FL can carry an\ni_orphaned_slot outside the mounted filesystem slot range.\nocfs2_wipe_inode() uses it to index osb_orphan_wipes before looking\nup the orphan directory, causing an out-of-bounds memory access.\n\nBUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\nRead of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85\nCall Trace:\n ...\n ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\n ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840\n ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline]\n ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295\n evict+0x38e/0x8f0 fs/inode.c:810\n iput_final fs/inode.c:1914 [inline]\n iput fs/inode.c:1966 [inline]\n iput+0x55b/0x8b0 fs/inode.c:1926\n ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374\n ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373\n ...\n\n[CAUSE]\nocfs2_validate_inode_block() validates i_suballoc_slot but leaves\nthe active ordinary orphan slot unchecked. Downstream consumers\nassume that the value is smaller than osb->max_slots.\n\n[FIX]\nReject an active i_orphaned_slot outside the slot range during\ndinode validation, before the inode reaches orphan wipe processing."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The attacker-controlled field is dinode i_orphaned_slot, read from the mounted block device in ocfs2_validate_inode_block()/ocfs2_read_locked_inode() and consumed by ocfs2_wipe_inode(); it is not a field of an o2net, NFS, or SMB message. Delivery is a locally mounted OCFS2 image (loop or other block device).\nAC:L - A crafted dinode with OCFS2_ORPHANED_FL and an attacker-chosen i_orphaned_slot is accepted before the fix. ocfs2_fill_super() calls ocfs2_complete_mount_recovery(), which queues ocfs2_recover_orphans(); that igets the orphan and iputs it into ocfs2_evict_inode()\u2192ocfs2_wipe_inode() with no race.\nPR:N - ocfs2_fs_type.fs_flags has no FS_USERNS_MOUNT, so only a privileged mount(2) via ocfs2_get_tree()/ocfs2_fill_super() reaches recovery. The attacker who supplies the image needs no host credentials; unlink cannot plant this value because ocfs2_orphan_add() writes osb->slot_num.\nUI:R - The bug fires from ocfs2_complete_recovery()\u2192ocfs2_recover_orphans() after the victim mounts the crafted volume through ocfs2_fill_super(). That mount is the required user action and cannot be treated as a standing export of already-on-disk metadata.\nS:U - The out-of-bounds accesses in ocfs2_check_orphan_recovery_state() and get_local_system_inode() corrupt memory in the kernel that mounted the OCFS2 volume. No KVM, Xen, or IOMMU boundary is crossed.\nC:H - get_local_system_inode() computes index = i_orphaned_slot * NUM_LOCAL_SYSTEM_INODES and reads an 8-byte inode pointer past the kcalloc'd local_system_inodes array (KASAN UAF read in ocfs2_get_system_file_inode). A non-NULL value is passed to igrab(), disclosing adjacent slab contents.\nI:H - ocfs2_check_orphan_recovery_state() does osb->osb_orphan_wipes[slot]++ with the untrusted i_orphaned_slot against a kcalloc(max_slots) array (max_slots \u2264 255), a heap out-of-bounds increment. The OOB pointer is then used as an inode in inode_lock/ocfs2_inode_lock.\nA:H - ocfs2_node_map_test_bit() BUG()s when i_orphaned_slot >= OCFS2_NODE_MAP_MAX_NODES (256). Smaller out-of-range slots still OOB-index osb_orphan_wipes[] and local_system_inodes[], which KASAN reported as slab-use-after-free during ocfs2_recover_orphans() in ocfs2_complete_recovery()."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/inode.c"], "versions": [{"version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "lessThan": "edd76be702c0f8702472888425237fb9219e1c43", "status": "affected", "versionType": "git"}, {"version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "lessThan": "f535a34831f8325950933b401c76bfa99624419c", "status": "affected", "versionType": "git"}, {"version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "lessThan": "dea50e8049b0db2eb3d468e2505034962e81d8cd", "status": "affected", "versionType": "git"}, {"version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "lessThan": "c6c908f9b4edfb04534b15573168ae038f7a9cbf", "status": "affected", "versionType": "git"}, {"version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "lessThan": "3d7c4b7ce7b4baedfd8699fa692cd95f77d332de", "status": "affected", "versionType": "git"}, {"version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "lessThan": "b2d31acbd3b182755b019183fb46949ba5e39b9f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ocfs2/inode.c"], "versions": [{"version": "2.6.16", "status": "affected"}, {"version": "0", "lessThan": "2.6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.16", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/edd76be702c0f8702472888425237fb9219e1c43"}, {"url": "https://git.kernel.org/stable/c/f535a34831f8325950933b401c76bfa99624419c"}, {"url": "https://git.kernel.org/stable/c/dea50e8049b0db2eb3d468e2505034962e81d8cd"}, {"url": "https://git.kernel.org/stable/c/c6c908f9b4edfb04534b15573168ae038f7a9cbf"}, {"url": "https://git.kernel.org/stable/c/3d7c4b7ce7b4baedfd8699fa692cd95f77d332de"}, {"url": "https://git.kernel.org/stable/c/b2d31acbd3b182755b019183fb46949ba5e39b9f"}], "title": "ocfs2: validate orphan slot during inode read", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ocfs2/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "edd76be702c0f8702472888425237fb9219e1c43", "status": "affected", "version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "versionType": "git"}, {"lessThan": "f535a34831f8325950933b401c76bfa99624419c", "status": "affected", "version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "versionType": "git"}, {"lessThan": "dea50e8049b0db2eb3d468e2505034962e81d8cd", "status": "affected", "version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "versionType": "git"}, {"lessThan": "c6c908f9b4edfb04534b15573168ae038f7a9cbf", "status": "affected", "version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "versionType": "git"}, {"lessThan": "3d7c4b7ce7b4baedfd8699fa692cd95f77d332de", "status": "affected", "version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "versionType": "git"}, {"lessThan": "b2d31acbd3b182755b019183fb46949ba5e39b9f", "status": "affected", "version": "b4df6ed8db0c387d38292e31f00adc4cd297ed5a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ocfs2/inode.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.16"}, {"lessThan": "2.6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate orphan slot during inode read\n\nPatch series \"ocfs2: validate active orphan slots during inode read\".\n\nOCFS2 trusts active ordinary and append-DIO orphan slots read from dinodes.\nA corrupted slot can therefore index osb_orphan_wipes or the slot-local\nsystem-inode cache outside their allocations before the corruption is\nreported.\n\nPatch 1 validates the ordinary orphan slot used by inode wipe processing.\nPatch 2 validates the append-DIO orphan slot used by DIO completion and\norphan recovery. Both checks reject corrupt metadata at the existing inode\nvalidation boundary.\n\n\nThis patch (of 2):\n\n[BUG]\nA corrupted dinode with OCFS2_ORPHANED_FL can carry an\ni_orphaned_slot outside the mounted filesystem slot range.\nocfs2_wipe_inode() uses it to index osb_orphan_wipes before looking\nup the orphan directory, causing an out-of-bounds memory access.\n\nBUG: KASAN: slab-use-after-free in ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\nRead of size 8 at addr ffff88800b767c00 by task kworker/u8:3/85\nCall Trace:\n ...\n ocfs2_get_system_file_inode+0x780/0x820 fs/ocfs2/sysfile.c:102\n ocfs2_wipe_inode+0x292/0xf70 fs/ocfs2/inode.c:840\n ocfs2_delete_inode fs/ocfs2/inode.c:1155 [inline]\n ocfs2_evict_inode+0x6c9/0x1170 fs/ocfs2/inode.c:1295\n evict+0x38e/0x8f0 fs/inode.c:810\n iput_final fs/inode.c:1914 [inline]\n iput fs/inode.c:1966 [inline]\n iput+0x55b/0x8b0 fs/inode.c:1926\n ocfs2_recover_orphans+0x610/0xe40 fs/ocfs2/journal.c:2374\n ocfs2_complete_recovery+0x5af/0xd00 fs/ocfs2/journal.c:1373\n ...\n\n[CAUSE]\nocfs2_validate_inode_block() validates i_suballoc_slot but leaves\nthe active ordinary orphan slot unchecked. Downstream consumers\nassume that the value is smaller than osb->max_slots.\n\n[FIX]\nReject an active i_orphaned_slot outside the slot range during\ndinode validation, before the inode reaches orphan wipe processing."}], "id": "CVE-2026-90205", "lastModified": "2026-10-30T13:20:46.223", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:15.573", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3d7c4b7ce7b4baedfd8699fa692cd95f77d332de"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2d31acbd3b182755b019183fb46949ba5e39b9f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c6c908f9b4edfb04534b15573168ae038f7a9cbf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dea50e8049b0db2eb3d468e2505034962e81d8cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/edd76be702c0f8702472888425237fb9219e1c43"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f535a34831f8325950933b401c76bfa99624419c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4df6ed8db0c387d38292e31f00adc4cd297ed5a,c6c908f9b4edfb04534b15573168ae038f7a9cbf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4df6ed8db0c387d38292e31f00adc4cd297ed5a,3d7c4b7ce7b4baedfd8699fa692cd95f77d332de)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4df6ed8db0c387d38292e31f00adc4cd297ed5a,b2d31acbd3b182755b019183fb46949ba5e39b9f)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T03:30:18.172091+00:00", "updated": "2026-09-20T03:45:12.286006+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-122", "CWE-20"]}